Android gaming is very satisfying kind of portable gaming. But, it is definitely not as satisfying on low-budget or entry-level or outdated devices. With games ranging from intensed high graphics to low graphics, from space consuming (1GB - 2.5GB) to not so space consuming (10MB-30MB). But, some of those games need very high standard hardware and software. But, what if you're still running Android 4.0 Ice cream sandwich, what if you're still using phone with a 1.2Ghz dual or quad core processor, what you're still on outdated Nvidia Tegra 3 processor or similar. So, why not upgrade your Android device into a better one without even spending a 'Kaley Cuoco' (Penny, pun intended).
So, get ready. Because, we're going on a ride to make your Android device better, better for gaming and overall performance.

1. Root your android device -

This is actually very easy to-do thing if you follow the steps properly on a rooting guide. Just search on Google - "How to root _______" your device name and model number. For example, you're using Galaxy Note 2. There are two main variants of the phone. So, if you want to find out which model number it has. Just go to Settings<About device<Model no. There, you got it.
You'll find every information about rooting here - http://forum.xda-developers.com/
After rooting, it's important to install custom recovery. Cwd recovery or TWRP are two of the best recoveries out there. Go through XDA forums, you'll find various guides to install them. Custom recoveries are very important in order to backup or restore your device and flashing modifications to your device. Also, rooting your device will void it's warranty.

2. Install Mods (Modifications) -

Blend Boosted - boosts your gpu rendering, improves audio output, improves battery and reduces lags of your device. Works with almost all the devices, but it's always better to make sure if it works with yours.

Crossbreeder Mod - helps you boost overall phone experience, reduces all kinds of lags from your phones. And works with most devices. It's also helps you boost your tethering connection, blocks ads and skyware which is definitely a bonus.

Nitro X - mod boosts your battery, automatically cleans your system with every boot, improves RAM management, optimises overall performance of your device. Best for those who love to multi-task.

Project Fluid - is basically a gaming tweak for your device for lagless gaming experience and better battery life. This mod mainly focuses on gaming needs of yours and improves your device in the same way.